From: Quan Zhou <[email protected]>
We should put dma into idle status before reset the component. Otherwise,
there would be a potential risk to make the dma hang. Let's reorder the
sequence to make sure the HW working properly.
Tested pass with 50000 times cold reboot on x86 platform.
Fixes: 0a1059d0f060 ("mt76: mt7921: move mt7921_dma_reset in dma.c")
Signed-off-by: Quan Zhou <[email protected]>
Signed-off-by: Deren Wu <[email protected]>
---
.../net/wireless/mediatek/mt76/mt7921/dma.c | 36 ++++++++++---------
1 file changed, 20 insertions(+), 16 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/dma.c b/drivers/net/wireless/mediatek/mt76/mt7921/dma.c
index d1f10f6d9adc..cf844224d618 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/dma.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/dma.c
@@ -66,22 +66,6 @@ static void mt7921_dma_prefetch(struct mt7921_dev *dev)
static int mt7921_dma_disable(struct mt7921_dev *dev, bool force)
{
- if (force) {
- /* reset */
- mt76_clear(dev, MT_WFDMA0_RST,
- MT_WFDMA0_RST_DMASHDL_ALL_RST |
- MT_WFDMA0_RST_LOGIC_RST);
-
- mt76_set(dev, MT_WFDMA0_RST,
- MT_WFDMA0_RST_DMASHDL_ALL_RST |
- MT_WFDMA0_RST_LOGIC_RST);
- }
-
- /* disable dmashdl */
- mt76_clear(dev, MT_WFDMA0_GLO_CFG_EXT0,
- MT_WFDMA0_CSR_TX_DMASHDL_ENABLE);
- mt76_set(dev, MT_DMASHDL_SW_CONTROL, MT_DMASHDL_DMASHDL_BYPASS);
-
/* disable WFDMA0 */
mt76_clear(dev, MT_WFDMA0_GLO_CFG,
MT_WFDMA0_GLO_CFG_TX_DMA_EN | MT_WFDMA0_GLO_CFG_RX_DMA_EN |
@@ -95,6 +79,22 @@ static int mt7921_dma_disable(struct mt7921_dev *dev, bool force)
MT_WFDMA0_GLO_CFG_RX_DMA_BUSY, 0, 1000))
return -ETIMEDOUT;
+ /* disable dmashdl */
+ mt76_clear(dev, MT_WFDMA0_GLO_CFG_EXT0,
+ MT_WFDMA0_CSR_TX_DMASHDL_ENABLE);
+ mt76_set(dev, MT_DMASHDL_SW_CONTROL, MT_DMASHDL_DMASHDL_BYPASS);
+
+ if (force) {
+ /* reset */
+ mt76_clear(dev, MT_WFDMA0_RST,
+ MT_WFDMA0_RST_DMASHDL_ALL_RST |
+ MT_WFDMA0_RST_LOGIC_RST);
+
+ mt76_set(dev, MT_WFDMA0_RST,
+ MT_WFDMA0_RST_DMASHDL_ALL_RST |
+ MT_WFDMA0_RST_LOGIC_RST);
+ }
+
return 0;
}
@@ -301,6 +301,10 @@ void mt7921_dma_cleanup(struct mt7921_dev *dev)
MT_WFDMA0_GLO_CFG_OMIT_RX_INFO |
MT_WFDMA0_GLO_CFG_OMIT_RX_INFO_PFET2);
+ mt76_poll_msec_tick(dev, MT_WFDMA0_GLO_CFG,
+ MT_WFDMA0_GLO_CFG_TX_DMA_BUSY |
+ MT_WFDMA0_GLO_CFG_RX_DMA_BUSY, 0, 100, 1);
+
/* reset */
mt76_clear(dev, MT_WFDMA0_RST,
MT_WFDMA0_RST_DMASHDL_ALL_RST |
--
2.18.0
From: Quan Zhou <[email protected]>
If chip reset worker triggered in remove process, chip dma may not be
pushed back to idle state properly. Since chip reset may corrupt the dma
flow, stop it before dma finalized.
mt7921_mcu_drv_pmctrl() may trigger reset worker, take
__mt7921_mcu_drv_pmctrl() instead.
Fixes: 033ae79b3830 ("mt76: mt7921: refactor init.c to be bus independent")
Signed-off-by: Quan Zhou <[email protected]>
Signed-off-by: Deren Wu <[email protected]>
---
drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
index 1a8a54a46dcc..c592903157d0 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
@@ -115,9 +115,10 @@ static void mt7921e_unregister_device(struct mt7921_dev *dev)
napi_disable(&dev->mt76.napi[i]);
cancel_delayed_work_sync(&pm->ps_work);
cancel_work_sync(&pm->wake_work);
+ cancel_work_sync(&dev->reset_work);
mt7921_tx_token_put(dev);
- mt7921_mcu_drv_pmctrl(dev);
+ __mt7921_mcu_drv_pmctrl(dev);
mt7921_dma_cleanup(dev);
mt7921_wfsys_reset(dev);
skb_queue_purge(&dev->mt76.mcu.res_q);
--
2.18.0